} else {
requestedEnvelopeInNativeCRS = reader.getOriginalEnvelope();
requestedEnvelope = requestedEnvelopeInNativeCRS;
}
final GridCrsType gridCRS = request.getOutput().getGridCRS();
// Compute the crs that the final coverage will be served into
final CoordinateReferenceSystem targetCRS;
if (gridCRS == null) {
targetCRS = reader.getOriginalEnvelope().getCoordinateReferenceSystem();
} else {
targetCRS = CRS.decode(gridCRS.getGridBaseCRS());
}
//
// Raster destination size
//
int elevationLevels = 0;
double[] elevations = null;
// grab the grid to world transformation
MathTransform gridToCRS = reader.getOriginalGridToWorld(PixelInCell.CELL_CENTER);
//
// TIME Values
//
final List<Date> timeValues = new LinkedList<Date>();
TimeSequenceType temporalSubset = request.getDomainSubset().getTemporalSubset();
if (temporalSubset != null && temporalSubset.getTimePosition() != null
&& temporalSubset.getTimePosition().size() > 0) {
for (Iterator it = temporalSubset.getTimePosition().iterator(); it.hasNext();) {
Date tp = (Date) it.next();
timeValues.add(tp);
}
} else if (temporalSubset != null && temporalSubset.getTimePeriod() != null
&& temporalSubset.getTimePeriod().size() > 0) {
for (Iterator it = temporalSubset.getTimePeriod().iterator(); it.hasNext();) {
TimePeriodType tp = (TimePeriodType) it.next();
Date beginning = (Date) tp.getBeginPosition();
Date ending = (Date) tp.getEndPosition();
timeValues.add(beginning);
timeValues.add(ending);
}
}
// now we have enough info to read the coverage, grab the parameters
// and add the grid geometry info
final GeneralEnvelope intersectionEnvelopeInSourceCRS = new GeneralEnvelope(
requestedEnvelopeInNativeCRS);
intersectionEnvelopeInSourceCRS.intersect(originalEnvelope);
final GridGeometry2D requestedGridGeometry = new GridGeometry2D(
PixelInCell.CELL_CENTER, gridToCRS, intersectionEnvelopeInSourceCRS, null);
final ParameterValueGroup readParametersDescriptor = reader.getFormat()
.getReadParameters();
GeneralParameterValue[] readParameters = CoverageUtils.getParameters(
readParametersDescriptor, meta.getParameters());
readParameters = (readParameters != null ? readParameters
: new GeneralParameterValue[0]);
//
// Setting coverage reading params.
//
final ParameterValue requestedGridGeometryParam = new DefaultParameterDescriptor(
AbstractGridFormat.READ_GRIDGEOMETRY2D.getName().toString(),
GeneralGridGeometry.class, null, requestedGridGeometry).createValue();
/*
* Test if the parameter "TIME" is present in the WMS request, and by the way in the reading parameters. If it is the case, one can adds
* it to the request. If an exception is thrown, we have nothing to do.
*/
final List<GeneralParameterDescriptor> parameterDescriptors = readParametersDescriptor
.getDescriptor().descriptors();
ParameterValue time = null;
boolean hasTime = timeValues.size() > 0;
ParameterValue elevation = null;
boolean hasElevation = elevations != null && !Double.isNaN(elevations[0]);
if (hasElevation || hasTime) {
for (GeneralParameterDescriptor pd : parameterDescriptors) {
final String code = pd.getName().getCode();
//
// TIME
//
if (code.equalsIgnoreCase("TIME")) {
time = (ParameterValue) pd.createValue();
time.setValue(timeValues);
}
//
// ELEVATION
//
if (code.equalsIgnoreCase("ELEVATION")) {
elevation = (ParameterValue) pd.createValue();
elevation.setValue(elevations[0]);
}
// leave?
if ((hasElevation && elevation != null && hasTime && time != null)
|| !hasElevation && hasTime && time != null || hasElevation
&& elevation != null && !hasTime)
break;
}
}
//
// add read parameters
//
int addedParams = 1 + (hasTime ? 1 : 0) + (hasElevation ? 1 : 0);
// add to the list
GeneralParameterValue[] readParametersClone = new GeneralParameterValue[readParameters.length
+ addedParams--];
System.arraycopy(readParameters, 0, readParametersClone, 0, readParameters.length);
readParametersClone[readParameters.length + addedParams--] = requestedGridGeometryParam;
if (hasTime)
readParametersClone[readParameters.length + addedParams--] = time;
if (hasElevation)
readParametersClone[readParameters.length + addedParams--] = elevation;
readParameters = readParametersClone;
// Check we're not being requested to read too much data from input (first check,
// guesses the grid size using the information contained in CoverageInfo)
WCSUtils.checkInputLimits(wcs, meta, reader, requestedGridGeometry);
//
// Check if we have a filter among the params
//
Filter filter = WCSUtils.getRequestFilter();
if (filter != null) {
readParameters = CoverageUtils.mergeParameter(parameterDescriptors, readParameters,
filter, "FILTER", "Filter");
}
//
// make sure we work in streaming mode
//
// work in streaming fashion when JAI is involved
readParameters = WCSUtils.replaceParameter(readParameters, Boolean.FALSE,
AbstractGridFormat.USE_JAI_IMAGEREAD);
//
// perform Read ...
//
coverage = (GridCoverage2D) reader.read(readParameters);
if ((coverage == null) || !(coverage instanceof GridCoverage2D)) {
throw new IOException("The requested coverage could not be found.");
}
// now that we have read the coverage double check the input size
WCSUtils.checkInputLimits(wcs, coverage);
// some raster sources do not really read less data (arcgrid for example), we may need to crop
if (!intersectionEnvelopeInSourceCRS.contains(coverage.getEnvelope2D(), true)) {
coverage = WCSUtils.crop(coverage, intersectionEnvelopeInSourceCRS);
}
/**
* Band Select (works on just one field)
*/
GridCoverage2D bandSelectedCoverage = coverage;
String interpolationType = null;
if (request.getRangeSubset() != null) {
if (request.getRangeSubset().getFieldSubset().size() > 1) {
throw new WcsException("Multi field coverages are not supported yet");
}
FieldSubsetType field = (FieldSubsetType) request.getRangeSubset().getFieldSubset()
.get(0);
interpolationType = field.getInterpolationType();
// handle axis subset
if (field.getAxisSubset().size() > 1) {
throw new WcsException("Multi axis coverages are not supported yet");
}
if (field.getAxisSubset().size() == 1) {
// prepare a support structure to quickly get the band index
// of a
// key
List<CoverageDimensionInfo> dimensions = meta.getDimensions();
Map<String, Integer> dimensionMap = new HashMap<String, Integer>();
for (int i = 0; i < dimensions.size(); i++) {
String keyName = dimensions.get(i).getName().replace(' ', '_');
dimensionMap.put(keyName, i);
}
// extract the band indexes
AxisSubsetType axisSubset = (AxisSubsetType) field.getAxisSubset().get(0);
List keys = axisSubset.getKey();
int[] bands = new int[keys.size()];
for (int j = 0; j < bands.length; j++) {
final String key = (String) keys.get(j);
Integer index = dimensionMap.get(key);
if (index == null)
throw new WcsException("Unknown field/axis/key combination "
+ field.getIdentifier().getValue() + "/"
+ axisSubset.getIdentifier() + "/" + key);
bands[j] = index;
}
// finally execute the band select
try {
bandSelectedCoverage = (GridCoverage2D) WCSUtils
.bandSelect(coverage, bands);
} catch (WcsException e) {
throw new WcsException(e.getLocalizedMessage());
}
}
}
/**
* Checking for supported Interpolation Methods
*/
Interpolation interpolation = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
if (interpolationType != null) {
if (interpolationType.equalsIgnoreCase("linear") || interpolationType.equalsIgnoreCase("bilinear")) {
interpolation = Interpolation.getInstance(Interpolation.INTERP_BILINEAR);
} else if (interpolationType.equalsIgnoreCase("cubic") || interpolationType.equalsIgnoreCase("bicubic")) {
interpolation = Interpolation.getInstance(Interpolation.INTERP_BICUBIC);
} else if (interpolationType.equalsIgnoreCase("nearest")) {
interpolation = Interpolation.getInstance(Interpolation.INTERP_NEAREST);
}
}
// adjust the grid geometry to use the final bbox and crs
final GeneralEnvelope intersectionEnvelope;
boolean reprojectionNeeded = !CRS.equalsIgnoreMetadata(nativeCRS, targetCRS);
if (reprojectionNeeded) {
CoordinateOperationFactory of = CRS.getCoordinateOperationFactory(true);
CoordinateOperation co = of.createOperation(nativeCRS, targetCRS);
intersectionEnvelope = CRS.transform(co, intersectionEnvelopeInSourceCRS);
} else {
intersectionEnvelope = intersectionEnvelopeInSourceCRS;
}
// compute the output resolution
double pixelSizeX;
double pixelSizeY;
if (gridCRS != null) {
Double[] origin = (Double[]) gridCRS.getGridOrigin();
Double[] offsets = (Double[]) gridCRS.getGridOffsets();
// from the specification if grid origin is omitted and the crs
// is 2d the default it's 0,0
if (origin == null) {
origin = new Double[] { 0.0, 0.0 };
}
// if no offsets has been specified we try to default on the
// native ones
if (offsets == null) {
offsets = estimateOffsets(reader, gridCRS, gridToCRS, intersectionEnvelope,
reprojectionNeeded);
}
// building the actual transform for the resulting grid geometry
AffineTransform tx;
if (gridCRS.getGridType().equals(GridType.GT2dSimpleGrid.getXmlConstant())) {
tx = new AffineTransform(offsets[0], 0, 0, offsets[1], origin[0], origin[1]);
} else if (gridCRS.getGridType().equals(GridType.GT2dGridIn2dCrs.getXmlConstant())) {
tx = new AffineTransform(offsets[0], offsets[1], offsets[2], offsets[3],
origin[0], origin[1]);
} else {
tx = new AffineTransform(offsets[0], offsets[4], offsets[1], offsets[3],
origin[0], origin[1]);